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Dalsze badanie struktur w okolicach Wyszkowa – wyniki prac terenowych

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Walesiak T.

Acta Societatis Metheoriticae Polonorum

2019

vol. 10

168-192

There are specified criteria used to verify if some geological structure was developed during hypervelocity impact. Some of them are related to the passage of a shock wave through rocks, so are considered as definitive. Porządzie, Jaszczulty & Ochudno are structures discovered in 2014 (based on LiDAR data). They have many features suggesting possible impact origin. In shape of Porządzie there can be even recognized possible traces of shock waves, similar to those present during hypersonic flow (similar to observed e.g. in an airburst shape of extraordinary bright meteors). Unfortunately, this kind of observations (morphometry) on Earth is still considered as not enough to confirm the crater. The aim of recent study was to search for additional traces, which may help to prove that mentioned structures were created during common oblique impact event. Initially there were chosen 3 locations for outcrops, but finally samples were collected from 6 smaller pits. In Porzadzie structure there were discovered cemented rocks with various shape and size (concretions or lithic, parautochtonous breccias) and 2 rocks with possibly shocked quartz, having basal sets of thin and straight lamellae. On once surface there were recognized hierarchal branched (including spoon-like) structures resembling shatter cones. In uprange, at depth of about 50–70 cm, soil was rich in small charcoal pieces (like in other relatively small craters: e.g. Campo del Cielo, Whitecourt, Kaali, Ilumetsa, Morasko). All these observations, taken together with previous results, are about to confirm impact origin of Porzadzie crater.

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1 Acta Societatis Metheoriticae Polonorum

1 2019

1 Walesiak T.

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Dalsze badanie struktur w okolicach Wyszkowa – wyniki prac terenowych